Ei chard mo n



am@ mm N,PETERS, PHOTO-LITHOGRAPHER WASHINGTON D C Letters PatentNo,76,795,fZatc 0Z April 14, 1868.

IMPROVED METAL'BEAMS.

dille Stimuli retentit in in tlgttt -irtltts' Eintritt rut mating arttnt the stmt.

TO ALL WI-IOM IT MAY CONCERN:

Be it known that I, Brennan MONTGOMERY, of theeity, county, and State ofNew York,- have invented certain new and useful Improvements inCorrugated Metal Beams for bridges and other purposes -and I'do herebydeclare the following to be a full and exact description thereof,reference boing had to the accompanyin drawngs,lforming apart of thisspecication, in which- Figure 1 is an elevationof a bridge constructedof my Improved metal beams.

Figure 2,' an elevation of one end of a double corrugated. sheet-metalbeam, provided ,with solid core-pieces.

Figure 3, n. transverse section in the line x a: of fig. 2.

Figure 4 illustrates :in improved method of combining and uniting the.ends of 'an arch ."n'd.; .ehord constructed of corrugated sheet metal.

Figure 5 isa transverse section in the line yy of fig. v4.

Figure 6 is a plan vieu', illustratingv an improved method of socorrugating and crimping the ends of the metal beams,,and of the saddleor anchor-plates fitting thereon, as to produce interlocking projectionsand indentations therein.

Figure 7 is a. transverse section in line z .e of 6, the saddle oranchor-plates being shown as in place. Figure 8 illustrates an improvedforked fastening-bolt, in combination with the end of nl corrugatedsheetmetal'beam to seeure'and tie the same as may be desired.

Figure 9is a. sectional view of the saddle oranchor-platcs, which Iemploy to secure the ends of the beams sui-table abutments, as appliedto single beams.

Similar letters indicate like parts in each of the gures.

' -The natureof my invention consists of improvements in the manner ofuniting, securing, and strengthening the improved corrugated metal beamswhich are the subject-matter of .sundry patents heretofore granted to mein the United-States and it relates, first, in vextendingv thebearing-ends of corrugated arched beams bey-ond the spring of the archin a right plane coincident with its chord; second, in the formation ofinterlocking elevationsad depressions, or counterpart concavities andcom'exities, in the overlapping ends of my improved corrugated metalbeams, and in the saddle or anchor-plates, made to embrace and holdthem, to prevent them from sliding or drawing asunder 'whenfittedtogethenand to relieve the bolts from the great strain otherwisebron'ghtt bear uponthemg and, third, in the employment of a forked bolt,by which to secure or tie the ends of'these corrugated -beams to anygiven object', theforksdn the shankof the bolt being made to -passbetween each fold of the corrugations inthe beam, so as to support andsteady them,and, at the same time, give a firm hold to thesecuring-bolts.

My improved beams, A A, are madev of metal, corrugated longitudinally,by means of rolls, 'into two (or more) deep folds, whose sides .areparallel, whose ends formalte'rnately inverted and uninverted arches,and

which' have a greater thickness of metal on the top'and bottom, or inthe crown of the arches, than in the'sides.

The' manner of constructing them will' be found fully described in theLetters-Patent of the United States heretofore grantedto me therefor.

The metal beams A maybe used singly, (see figs. 5,58, and 9,) or, wheregreater strengthiis required, doubled, edge to edge, as shown 'in figs.1, 2, and 3. In the construction of upright supporting-columns,` and,

more especially, in providing for uniting the double metal beams A endto end, so as to form onecontinuous piece, I combine therewith auxiliarysolid metallic core-beams, B, by inserting the same -into thelongitudinal chambers which are formedin the metal beams by theircorrugations. The core-beams B may extend the entire length-of. thecorrugated beam within the same, or, :where the sole object is toprovide -for a strong, substantial joint between the ends o f any two,they need but to extend within the metal suiiiciently far toadmit of a.secure, rigid fastening thereto. To obtain` suchfastening, I Vusetransverse bolts, a a, passing through the metal and the solidcore-piece, as seen in iig. 3. v

In uniting the ends of adjacent metal beams which'are made single, Isimply overlap them, asseen in figs;

4 and 5, and fasten them by one or more bolts passing through the two;but, in order to protect the bolts from the danger of being cut off orbroken, I cause the corrugations to deviate from a right line by curvingthem in and out longitudinally, as shown at o, fig. 6, and also breakthe continuity of their surface by indentations and counterpartelevations, b Z, therein, so formed as that the elevations in thesurface of one piece will coincide and fit into the indentations of thatVupon which it is to be superimposed. By thus interlocking them, the twopieces are prevented from sliding apart, and the tic thus obtainedreceives all longitudinal strain tending to pull them apart, and thusrelieves the bolts. By forming the saddle and anchor-plates C C (betweenwhich the ends of the beams, secured to the abutments of'a bridge, areheldlwitn .curved recesses and'indentations, corresponding to those inthe cqrrdgated metal beam, the advantage ofthe interloclcingof the onewith the other is available in securing, in the strongest mannerthebeams totheir abutments.

To obtaina rmer hold between an arch, D, constructed of a corrugatedmetal beam and its proper chordbeam, I cause the ends of the arch tocoincide, indirection, with the chord-beamvby bending the ends of thearch until they reach the plane of its'chord,fas shown r`atfe, fig. 4.'lhese ends, ef, will thenV coincide with the straight beam A, formingthe chord when superimposed thereon, so as that a `single bolt may serveto secure both, and, in this ense, interlocking indentations may beformed in the two,'as an additional security inthe' fastening, as hasb'ecnhereinbefore described. i

Where single corrugated metal beams are employed, instead of using thesaddle-plates C, as described, I employ a bolt, E, havinga forked shank,K, se disposed as to pass in between'the folds m of the metal beam, ateither end thereof, inthe manner illustrated in iig. 8 of the drawings.By this arrangement of the bolt, it may be secured to the beam bytransversebolts, n, in the most secure and rigid manner, so as tobecome, in fact, a part of the beam.

In constructing a bridge of my improved metal beams, I prefer to maltethe arch D wider andheavicr than lthe floor-beams A, formingits chord.The beamsl are all made double and hollo\v`,beng"formcd of corrugatedpeces,iunited, as illustrated in figs. 3 and-'lof the drawings, edge toedge. "lhe ends of the corrugated uprights H in the truss-work arecompressed andilattened to enter the central recess of the beams aboveand below, so as to be secured by transverse bolts, pp, passing throughthe two folds forming the recess, and they are strengthened by verticalbolts, o' r, passing down through the central chamber therein, and whichserve to secure the transverse tie-beams KA of the bridge, as seen in{-g. 1. These vertical tie-bolts r may be pased either through the foldof the cross-beam, as seen at 12, fig. 1,01` through its edges, asillustrated at 13, fig. 1.

In long spans, requiring more than one beam, I unite two (or more) ofthem invone continuous length by means of core-beams, as illustrated infigs. 2 and 3, extending -them on'either side of the joint far enough togive a firm, rigid bearing thereto; or, in some cases, the core-beamsmay extend the entire length of the bridge, breaking joints with thoseof the enveloping-beams.

The ends of the bridge are securely anchored to the abutments S by meansof anchor-plates C C. The lower one, C, `firmly embedded and tied to themason'ry, is channelledto receive closely the folds of the corrua gatedbeams, and, moreover, indented in the manner illustrated in tig. to4receive and interlock with corresponding indentatons and curves in thecorrugations at the ends of said beams, to preventfthemfrom slipping.

When the ends ofthe beams are laid in place upon thelower-.anchor-plates C, the upper or saddle-plates C are fitted closelythereon,.(bcingchannellcd in such manner as to conform thereto,) andthen bolted down through the beams and anchor-plate C, fastening thewhole firmly in place, as illustrated in figs. 1 and 7.

Having thus fully described my invention, what I claim therein-as new,and desire to Vsecure by Letters Patent, is v 1. I claim so shaping andforming the ends of an arch constructed of corrugated metal as that saidends shall coincide wtlrthe straight ends of'a beam forming a chord tosaid a'rch, if superimposed thereon, substantially in the manner hereinset forth.

2, Imparting a curved er irregular line to the folds of a corrugatedmetal beam, substantially in the manner and for the purpose hereinspecified.

3. Indenting or breaking the surface o f the folds or corrugations in acorrugated metal beam, substantinllly as and for the purpose herein setforth.

4. A bolt, E, having a forked shank, so arranged and disposed as to titwithin and between the folds of a at the ends thereof, substantially inthe manner and for the purpose herein set forth.

corrugated metal beam,

this twenty-third The foregoing specification of my improvement incorrugated metal beams signed by me,

day of July, A. D. 1867'.

RICHARD MONTGOMERY.

Witnesses R. A. ADAMS, RANDOLPH McAnAM.

